Of course! Use the alpha as a track matte!
Never even crossed my mind. Thank you so much for your help John, this was certainly an exercise in frustration.
I’ve already used spill suppression and key cleaner (for the rough edges of his wool coat), but I’ll certainly take a look into hte “ultra” method, as well as the aforementioned alpha track matte.
Still kicking myself that I didn’t think of that! Thanks again so much for the response, you’re the best!